LXR linux/arch/arc/include/asm/ptrace.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4 *
   5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
   6 */
   7#ifndef __ASM_ARC_PTRACE_H
   8#define __ASM_ARC_PTRACE_H
   9
  10#include <uapi/asm/ptrace.h>
  11#include <linux/compiler.h>
  12
  13#ifndef __ASSEMBLY__
  14
  15/* THE pt_regs: Defines how regs are saved during entry into kernel */
  16
  17#ifdef CONFIG_ISA_ARCOMPACT
  18struct pt_regs {
  19
  20        /* Real registers */
  21        unsigned long bta;      /* bta_l1, bta_l2, erbta */
  22
  23        unsigned long lp_start, lp_end, lp_count;
  24
  25        unsigned long status32; /* status32_l1, status32_l2, erstatus */
  26        unsigned long ret;      /* ilink1, ilink2 or eret */
  27        unsigned long blink;
  28        unsigned long fp;
  29        unsigned long r26;      /* gp */
  30
  31        unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
  32
  33        unsigned long sp;       /* User/Kernel depending on where we came from */
  34        unsigned long orig_r0;
  35
  36        /*
  37         * To distinguish bet excp, syscall, irq
  38         * For traps and exceptions, Exception Cause Register.
  39         *      ECR: <00> <VV> <CC> <PP>
  40         *      Last word used by Linux for extra state mgmt (syscall-restart)
  41         * For interrupts, use artificial ECR values to note current prio-level
  42         */
  43        union {
  44                struct {
  45#ifdef CONFIG_CPU_BIG_ENDIAN
  46                        unsigned long state:8, ecr_vec:8,
  47                                      ecr_cause:8, ecr_param:8;
  48#else
  49                        unsigned long ecr_param:8, ecr_cause:8,
  50                                      ecr_vec:8, state:8;
  51#endif
  52                };
  53                unsigned long event;
  54        };
  55
  56        unsigned long user_r25;
  57};
  58
  59#define MAX_REG_OFFSET offsetof(struct pt_regs, user_r25)
  60
  61#else
  62
  63struct pt_regs {
  64
  65        unsigned long orig_r0;
  66
  67        union {
  68                struct {
  69#ifdef CONFIG_CPU_BIG_ENDIAN
  70                        unsigned long state:8, ecr_vec:8,
  71                                      ecr_cause:8, ecr_param:8;
  72#else
  73                        unsigned long ecr_param:8, ecr_cause:8,
  74                                      ecr_vec:8, state:8;
  75#endif
  76                };
  77                unsigned long event;
  78        };
  79
  80        unsigned long bta;      /* bta_l1, bta_l2, erbta */
  81
  82        unsigned long user_r25;
  83
  84        unsigned long r26;      /* gp */
  85        unsigned long fp;
  86        unsigned long sp;       /* user/kernel sp depending on where we came from  */
  87
  88        unsigned long r12, r30;
  89
  90#ifdef CONFIG_ARC_HAS_ACCL_REGS
  91        unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
  92#endif
  93#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
  94        unsigned long DSP_CTRL;
  95#endif
  96
  97        /*------- Below list auto saved by h/w -----------*/
  98        unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
  99
 100        unsigned long blink;
 101        unsigned long lp_end, lp_start, lp_count;
 102
 103        unsigned long ei, ldi, jli;
 104
 105        unsigned long ret;
 106        unsigned long status32;
 107};
 108
 109#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
 110
 111#endif
 112
 113/* Callee saved registers - need to be saved only when you are scheduled out */
 114
 115struct callee_regs {
 116        unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
 117};
 118
 119#define instruction_pointer(regs)       ((regs)->ret)
 120#define profile_pc(regs)                instruction_pointer(regs)
 121
 122/* return 1 if user mode or 0 if kernel mode */
 123#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
 124
 125#define user_stack_pointer(regs)\
 126({  unsigned int sp;            \
 127        if (user_mode(regs))    \
 128                sp = (regs)->sp;\
 129        else                    \
 130                sp = -1;        \
 131        sp;                     \
 132})
 133
 134/* return 1 if PC in delay slot */
 135#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 136
 137#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
 138#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
 139
 140#define STATE_SCALL_RESTARTED   0x01
 141
 142#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
 143#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
 144
 145#define current_pt_regs()                                       \
 146({                                                              \
 147        /* open-coded current_thread_info() */                  \
 148        register unsigned long sp asm ("sp");                   \
 149        unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
 150        (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
 151})
 152
 153static inline long regs_return_value(struct pt_regs *regs)
 154{
 155        return (long)regs->r0;
 156}
 157
 158static inline void instruction_pointer_set(struct pt_regs *regs,
 159                                           unsigned long val)
 160{
 161        instruction_pointer(regs) = val;
 162}
 163
 164static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 165{
 166        return regs->sp;
 167}
 168
 169extern int regs_query_register_offset(const char *name);
 170extern const char *regs_query_register_name(unsigned int offset);
 171extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
 172extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
 173                                               unsigned int n);
 174
 175static inline unsigned long regs_get_register(struct pt_regs *regs,
 176                                              unsigned int offset)
 177{
 178        if (unlikely(offset > MAX_REG_OFFSET))
 179                return 0;
 180
 181        return *(unsigned long *)((unsigned long)regs + offset);
 182}
 183
 184#endif /* !__ASSEMBLY__ */
 185
 186#endif /* __ASM_PTRACE_H */
 187